fatal error when save product

[dimitrilongo]

Hello
found 2023-05-09T08:24:29+00:00 CRITICAL Uncaught Error: Undefined constant GuzzleHttp\ClientInterface::VERSION in /public_html/wp-content/plugins/shopping-feed/vendor/shoppingfeed/php-sdk/src/Http/Adapter/Guzzle6Adapter.php:134

when save product (error 500)